Reamer.



A. E. CHURCH.

APPLICATION FILED OUT. 1, 1908. 941,91 2. Patented Nov. 30, 1909. 2 SHEETS-SHEET Z. .il E-JQL Q/vihwooao f/fAdfC/i FFIKU.

ALBERT E. CHURCH, OF NEW BRITAIN, CONNECTICUT.

BEAMER.

T 0 all whom "it may concern:

Be it known that I, ALBERT E. CHUnoi-I, a citizen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Reamers; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in reamers, and more particularly to that class of such devices in which the blades of the tool are adjustably seated in converging grooves cut longitudinally through the peripheral surface of a cylindrical stock.

The objects of the invention are to diminish the labor and cost of manufacture of such reainers; to provide in such reamers ample clearance in immediate proximity to the cutting edges of the blade; to make the blade holding grooves of such shape that they will be efficient without being large or deep, and to provide for the adjustment of the reamer blades.

In the accompanying drawings,Figure 1 is a central longitudinal sectional view of a reamer constructed in accordance with the invention; Fig. 2 is a cross section taken on the plane indicated by the dotted lines 2-2 of Fig. 1; Fig. 3 is an end view of the adjustable plate member; Fig. 4 is a View in side elevation of the body portion of the reamer, illustrating a slightly modified form of the invention; Fig. 5 is a front end view of Fig. 4; and Fig. 6 is a cross section taken on line 66 of Fig. 4.

In the embodiment illustrated, the reamer is shown as comprising a cylindrical body portion or stock 1, of gradually and decreasingly tapered form from its inner end, said end being formed with a thread 2, the purpose of which will be disclosed, and a threaded longitudinal socket 3 being formed in the outer or opposite end of said stock or body portion.

The numeral l indicates the shank which as shown is formed by an extension or pro longation of the body portion.

In carrying out the invention, the body portion or stock of the reamer is formed with a plurality of longitudinally disposed spaced peripheral grooves 5, of approximately circular form in which are adapted Specification of Letters Patent.

AppIication filed October 1, 1908.

Patented Nov. 39, 1909.

Serial No. 455,658.

to be arranged the cutting blades 6 of the reamer. Said blades are removably secured in position by keys, preferably in the form of cylindrical pins 7, fitting in registering recesses formed in the outer end and periphery of the stock or body portion and adjacent ends of the cutting blades, an annulus or fastening nut 8 screwing on the thread of the body or stock of the reamer,

the former being formed with an inwardly extending annular flange 9 adapted to engage corresponding extensions or shoulders 10, formed or produced at the extreme inner ends of the cutting blades. A suitable retaining plate 11, formed with a recessed head 12 and with a centrally disposed thread ed stem 13, is arranged at the outer end of the stock, the body of said plate being adapted to engage the outer ends of the keys 7 when screwed in position by screwing the stem 13 thereof in the socket of the body orstock, whereby said keys will be held against displacement.

From the construction illustrated and defined it will be readily seen that by employing an annulus or ring 8 at one end of the stock as shown and an adjustable retaining plate at the opposite end thereof, the cutting blades (3 may be adjusted longitudinally, and in either direction.

In practice, the cutting members 6 are milled out to form suitable cutting edges 14, as shown.

In the modified form of the invention illustrated in Figs. 4, 5, and 6 the body or stock of the reamer is formed with two series of longitudinally extending inclined grooves 15 and 16, respectively, the grooves of the series 15 extending in the same direction and the grooves of the series 16 which alternate therewith, being arranged to extend in an opposite direction. It has been found by experience that by arranging the grooves in which the cutting blades or members are arranged in this manner, the cutting blades will cut one eighth of an inch to each revolution of the reamer without any chatter whatever and a perfectly smooth bore will be produced as a result.

A reamer of the form illustrated and described can be made with a minimum of labor and expense in the following manner: The stock or body portion is turned down in a lathe to its described condition after a plurality of longitudinally disposed cylindrical holes corresponding with the number of in the position shown.

grooves have been drilled therethrough "from one end to the other. The cutters are formed from rods of cold rolled steel, subjected to a single milling cut which removes material from each side of the cutting line and forms a groove or depression immediately in front of such line as a clearance for the chip. This milling of the blades can be done conveniently after the same have been inserted In other adjustable reamers the blades are made of tool steel, machined with great exactness, and the plain or dove-tailed grooves in which they are seated have to be milled out with great exactness, while in my reamer the blades can be made 01 cold rolled steel and may be milled to form the cutting edges after having been placed in position, no lathe work being required. In other reamers the blades are milled into shape before being placed in position, and are turned in position after being so placed.

It will be seen by providing a reamer as shown, considerable saving in labor and ma terial is a result, and reamers can be consequently produced at much less cost. Itmay be further stated that a reamer of the construction shown may be made at a less cost than a solid or non-adjustable reamer of the same size, because of the greater labor of cutting the latter, and of a more costly steel, which must be used in the latter, as a solid reamer must be made of tool steel, while in a reamer of the construction claimed the body may be made of machine steel and the blades of cold rolled steel.

Having described my invention, I claim:

A reamer of the character described, comprising a tapering body portion having undercut grooves and longitudinal pin receiving recesses in the outer ends of the walls of its grooves, said body portion being also formed with an exterior thread at its inner end and with a centrally threaded socket in its opposite end, cylindrical cutting members seated in the grooves of the reamer body, said members having extensions at their inner ends and longitudinal recesses at their opposite ends to register with the recesses in the grooves of the reamed body, an annulus screwing on the inner end of the body portion and having a recess to receive the extensions of the cutting members, key pins insertible in the registering recesses of the body portion, and cutting members to key the latter in position, and an adjust able retainer having a threaded stem to screw into the socket of the body portion and a fiat body having a smooth inner surface to it against the outer ends of the cutting members and key pins.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ALBERT E. CHURCH. lVitnesses Erma Reruns, STANLEY M. HUNT. 

